Method for adjustment of a transmitter carrier frequency in a subscriber station of a point-to-multipoint radio transmission system

US6285864A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wolfgang Ruemmer · Backnang, DE
• Andreas Bollmann · Bietigheim-Bissingen, DE

Key dates

• Filing date: Jul 20, 1998
• Grant date: Sep 4, 2001
• Expiry date: Jul 20, 2018

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03J7/02
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

The method includes deriving all receiver carrier frequencies and all transmitter carrier frequencies of the base station from a common reference frequency; comparing a transmitter carrier frequency of a subscriber station with a receiver carrier frequency in the base station to obtain an average frequency deviation; transmitting the average frequency deviation to the concerned subscriber station; adjusting the transmitter carrier frequency of the subscriber station so that the frequency deviation is minimized; when data is to be transmitted with other carrier frequencies, switching from the receiver channel and transmitter channel to other channels; and prior to switching deriving new transmitter and receiver carrier frequencies (TMTx2, TMRx2) of the subscriber station according to the following formulae: EQU TMTx2={1/C}[BSRx2+ZFLOBS(m'-n.multidot.C)+RFLOBS(1-R)], EQU TMRx2={1/C}[BSTx2+ZFLOBS(m-n'.multidot.C)+RFLOBS(1-R)], wherein BSRx2 and BSTx2 are new receiver and transmitter carrier frequencies in the base station, RFLOBS and ZFLOBS are reference frequencies for respective frequency converters in the base station, C is ZFLOTM/ZFLOBS, ZFLOTM and ZFLOBS are respective reference …